I think it's pretty obvious that this got axed. So, if the author suddenly only had one or two chapters to close things out... This was a rather good way of doing it, tbh, cause at least them getting together here was pretty cute and there was no time skip nonsense.
With that said, yeah, it kinda sucks it's over (it's one of the few "fantasy" yuri I liked), especially cause it feels like they were setting up the gyaru-looking vampire to have a whole backstory at one point (I thought she was gonna turn out to not be a vampire or be half or something).